2218-T71 Aluminum alloy,Aluminum 2218-T71 alloy,E FORU

### **Product Datasheet: 2218-T71 Aluminum Alloy** --- #### **1. Overview** 2218-T71 Aluminum Alloy is a high-temperature aluminum-copper alloy supplied in the T71 temper (solution heat-treated, quenched, and artificially aged to a specific condition). This temper provides enhanced dimensional stability and improved stress corrosion resistance compared to the T61 temper, while maintaining good high-temperature performance. The T71 condition is particularly suitable for applications requiring long-term stability under thermal cycling conditions and exposure to elevated temperatures up to 250°C (480°F). --- #### **2. International Standards** - **UNS**: UNS A92218 - **ASTM**: ASTM B211 (Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire) - **AMS**: AMS 4126 (Aerospace Material Specification) - **AA (Aluminum Association)**: AA 2218 - **ISO**: ISO 6362 (Wrought Aluminum and Aluminum Alloy Extruded Rod/Bar, Tube, and Profiles) --- #### **3. Chemical Composition (Weight %)** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 3.5–4.5 | | **Magnesium (Mg)** | 1.2–1.8 | | **Iron (Fe)** | 0.9–1.3 | | **Silicon (Si)** | 0.9–1.2 | | **Nickel (Ni)** | 1.7–2.3 | | **Zinc (Zn)** | ≤ 0.25 | | **Manganese (Mn)** | ≤ 0.20 | | **Chromium (Cr)** | ≤ 0.10 | | **Titanium (Ti)** | ≤ 0.20 | | **Other Elements** | ≤ 0.05 each | | **Total Others** | ≤ 0.15 | --- #### **4. Physical Properties** | Property | Value | |----------|-------| | **Density** | 2.81–2.83 g/cm³ (0.1015–0.1022 lb/in³) | | **Melting Range** | ~530–640°C (985–1185°F) | | **Electrical Conductivity** | ~36–41 % IACS | | **Thermal Conductivity** | 125–145 W/m·K | | **Coefficient of Thermal Expansion** | 22.0–23.0 × 10⁻⁶/°C (20–100°C) | | **Modulus of Elasticity** | 72.0–74.0 GPa (10,450–10,750 ksi) | --- #### **5. Mechanical Properties (T71 Temper Condition)** | Property | Room Temperature | 200°C (390°F) | 250°C (480°F) | |----------|------------------|----------------|----------------| | **Tensile Strength (Ultimate)** | 360–410 MPa | 260–310 MPa | 200–250 MPa | | **Tensile Yield Strength** | 250–300 MPa | 180–230 MPa | 140–190 MPa | | **Elongation at Break** | 10–14% | 12–16% | 15–20% | | **Shear Strength** | 210–250 MPa | 150–190 MPa | 120–160 MPa | | **Hardness (Brinell)** | 95–115 HB | 70–90 HB | 55–75 HB | | **Stress Rupture Strength** | - | 120–150 MPa (100h) | 80–110 MPa (100h) | --- #### **6. Key Characteristics & Advantages** - **Enhanced Dimensional Stability**: Superior to T61 temper for precision applications - **Improved Stress Corrosion Resistance**: Better performance in corrosive environments - **Good High-Temperature Strength**: Maintains properties at elevated temperatures - **Thermal Cycling Resistance**: Suitable for applications with temperature variations - **Reduced Residual Stresses**: T71 aging minimizes internal stresses - **Machinability**: Good machining characteristics with proper tooling - **Long-Term Reliability**: Proven performance in demanding applications --- #### **7. Product Applications** - **Aircraft Engine Components**: Cylinder heads and crankcases - **Precision Machinery**: Components requiring dimensional stability - **Automotive Racing**: High-performance engine parts - **Industrial Equipment**: Parts for elevated temperature service - **Pump and Valve Components**: For high-temperature fluids - **Tooling Applications**: Jigs and fixtures for elevated temperature use --- #### **8. Available Forms** - Forging Stock - Bar and Rod - Die Forgings - Precision Machined Components - Custom Fabricated Parts --- #### **9. Processing and Special Considerations** - **Heat Treatment**: Specific aging cycle to achieve T71 properties - **Machining**: Good machinability with carbide tooling recommended - **Stress Relief**: Additional thermal treatments possible if required - **Surface Treatment**: Can be anodized or coated for enhanced protection - **Quality Assurance**: Stringent testing for high-temperature applications - **Storage**: Proper handling to maintain temper properties --- **Disclaimer**: The information presented is typical and for reference only. Actual properties may vary with processing and specific service conditions. For high-temperature applications requiring dimensional stability, contact our technical service team for specific data and processing recommendations.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1609 gallon liquid totes Special package is available on request.